Envelop-machine.



M. VIERENGEL.

ENVBLOP MACHINE.

APPLICATION FILED 03.27, 1910A PatentedAug. 8, 1911.

mm3@ oww M. VIBRENGEL. ENVELOP MACHINE.

APPLICATION FILED APB.27, 1910.

,@5759 Ptented Aug. 8, 1911.

8 SHEETS-SHEET 2.

M. VIERENGEL.

ENVBLOP MACHINE.

APPLICATION FILED APR.27, 1910.

Patented Aug. 8, 1911.

8 SHEETS-SHEET 3.

M. VIBRENGEL.

ENVELOP MACHINE.

APPLICATION HLBD APR. 27, 1910.

Patented Aug. 8

m m u w Ng m. H Q M\\\\\\\\ M. VIBRENGEL. BNVELOP MACHINE.

APPLIUATION FILED 111111.27, 191 o.

PatentaAug. 8, 1911.

8 SHEETS-SHEET 5.

I iQ-15 M. VIERENGEL.

ENVELOP MACHINE.

APPLICATION FILED ML2?, 1910.

8 SHEETS-SHEET 6.

Mmmm:

Patend Aug-8,1911.

M VIERENGEL.

ENVELOP MACHINE. APPLIATION FILED 11211.27, 1910.

Patented Aug. ,8, 1911.

8 SHEETS-SHEET 7.

WMM/Lewes: {Jn/vent z M. VIERENGEL.

ENVELOPv MACHINE.

ApPLIgATIoN FILED APR. 27, 1910.

Patented Aug. 8, 1911.

8 SHEETS-SHEET 8.

lllll L UNTTED sTATEs PATENT oEEIcE.

MATTHEW'VIERENGEL, BROOKLYN, NEW YORK.v

To all whom it may concern:

Be it known that I, MATTHEWVIERENGEL,

a citizen of the United States, and a resident` of the borough of Brooklyn, county of of this type can be arranged to operate in conjunction wit-h an automatic feeding machine for supplying successive blanks from an adjustably mounted pile, or they can be arranged to operate in conjunction-with suitable blank cutting mechanism by which the successive blanks are cut from continuous rolls of paper. I prefer to employ my 1nvention in conjunction with an automaticpaper feeding machine in which the previously prepared blanks are supportedin an adjustably mounted feede and successively separated and passed tothe blank feeding mechanism of the envelop machine.

The main object of my present invention is to provide a. simple andeffective envelop machine which is capable of ready adjustment for making envelops of various sizes and which, by a simple interchange of cer- .tain of the final parts of the mechanism, can

be adapted tothe manufacture of different styles `of envelops. The general construction of my machine is the same for making both a center seam envelop and a side seam envelop,

the modifications required for these two forms of envelops being in the arrangement of the creasing and pasting devices as will hereinafter appear.

In general construction, my improved envelop machine comprises an endless travel-- ing belt provided wlth a central serles of automatically operated grippers adapted to take the leading edge of the successive blanks from an automatic paper feeding machine and convey the blanks through the side fold forming devices and deliver the formed blanks to the finalcreasing and sealing devices. The automatic feeding machine is arranged to deliver the blanks to a gripper cylinder which carries'them forward to suitable transferring feeding devices from which l ENvELoP-MAGHINE.

l, Specification ot Letterslatent. Application Bled Aprilv 27,l 19,10. s eriaLo. 557,879. I

Patentedfug.. 8,1. 1911..

they are taken bythe grippers upon the endless belt.

In making thencenter seam form of envelop, the blank is carried by the gripper cylinder under a single pasting roll for'ap plyin aline of paste .upon the inner'face of one o the broad side flaps prior to the pas-- sage of the blank through the side fold forn 1.

ing mechanism, which folds inwardly the two side flaps with the pasted flap on top preparatory tothe action of the center seam ressure sealing device. The transferring eeding devices engage the blank along a central longitudinal plane so as not to vinterfere with this line of paste upon one of the side flaps. 4After the formation of the center seam in this manner, the partly formed envelop is conveyed to the bottom flap creasing 'deviceand the bottom flap' pasting device -and then through suitable pressure devices for folding over the pasted bottom flap and' sealingand completing the envelop. If the envelop is formed with a top flap, the .final action of the machine is to transversely crease said top flap to cause it to fold over accurately.

' In the-manufacture of the side seam envelop, the preliminary 'pasting' roll is removed or put out of action and no paste is applied until after the blank has passed the side fold forming mechanism, and the en d Hap creasing device. With this form of envelop, two lines of paste are appliedto the inwardly folded'narrow side'flaps and the long bottom fiap is ycarried over and pressed against the two lines of paste upon said inwardly folded sideflaps. l

The main conveyer belt, which takes the blanks from the transfer feeding devices leading from the automatic feeding machine, is formed with a series of transverse cleats. upon its inner face which engage insockets or recesses formed in parts of the peripheries `of the supporting and operating wheels or pulleys. These transverse cleats are formed in sections toenable their engaging portions to be adjusted longitudinally of the belt to facilitate the accurate adjustment of the belt upon said supporting wheels or pulleys to properly time the action of the grippers. The conveying belt is preferably a broad leather belt having the conveying grippers arranged in slots cut through `it in its central longitudinal plane at equal distances apart. Each gripper is 4pivotally mounted upon brackets secured to the inner face of the conveying belt, said brackets being provided with friction rollers which run upon suitable track bars extending longitudinally of the machine parallel with the carrying portion of the belt. The grippers are lactuated by means of stationary cam tracks by which they are opened and closed at the proper points to take and deliver a blank.

One of the most important features of my present invention is the construction of the mechanism for impartin the transverse creases tothe end flaps of t e envelop.A In envelops having a top Hap, there are of course two transverse creases formed,.where as, in envelopes having no top flap', there is but'a sin le transverse crease formed in the bottom flgap. One set of the creasing devices (comprising coperating male and female members, arranged res ctively above and below the plane of feedhas a certain timedA relation to the grippers of the blank feeding mechanism, to form the crease between the body of the envelop and the iap at the bottom of the envelop, whether the bottom flap be a narrow one as in the center seam envelop, or a broad one of the whole length of the envelop as in the side seam enve creasing devlces comprises male and female members removably mounted in adjustable rotary carryin frames,- arranged respectively above an, below the plane of feed, so that theiruse can be dispensed with when making envelops withoutthe to fiap. The top flap creasing devices are adjustable circumferentially of their carrying frames to place them closer to or farther away circumferentially from the bottom flap creasing devices to facilitate the manufacture of envelops of different sizes. In carrying out this adjustable idea of this part of my machine, I provide each carrying frame with two or more segmental frame pleces upon a v'rotary shaft with a plurality of dove-tail sockets or pockets in theirperipheries to receive the adjustable male and female creasing bars. The creasing bars can be mounted in any of said dove-tail sockets or pockets distance circumferentially from' the bottom to placethem at approximately the desired flap .creasin members, the requisite final adjustment eing accomplished by adjusting the se mental frame pieces 'upon their shafts. T is under rotary frame of the y creasing devices also carries automatic grip pers which are desi ed to engage the folded side edges of the lanks after the completion of the center seam in the one form of' envelop, andv prior to the formation of the side seam in theother form of envelop.` In the form of the machine for the center seam envelop, there is a bottom flap pasting device carried by the upper rotary sectional frame referred to, which imparts a line of op. lThe other set of transversepaste upon the bottom ,ap simultaneously with the formation of the bottom flap crease in that form of envelop. This bottom flap pasting device comprises a spring blade projecting from a rock shaft journaled in two ofthe arms of said upper rotary frame and controlled by a rock arm which runs in peripheral engagement with a stationary cam so that once in each revolution of s aid frame, said sprin pasting blade will be thrown into periperal engagement with a pasting roll operatin in a paste reservoir and A`then be carrie .around and wiped against the roject-ing bottom ap at the moment the ottonrcrease is made.

The rippers upon the under rotary sec,- tional rame are designed to move radially and longitudinally of their supporting frame for the purpose of moving them into and out of engagement with the blank. The exact construction of said grippin@ mechanism will be hereinafter more fully explained.

In arranging my machine for the malinlfacture of side seam envelops, I remove the paste receptacle and roller of the preliminary form and mount a substitute paste roller in an extended pair of brackets arranged lower down than the brackets of the first form of pasting device, and mount upon a suitable shaft a pair of paste apply-l with reference to the accompanying draw` ings, and afterward point out the novelty more particularly in the annexed claims.

In said drawings: Figure l is a side elcvation of my improved envelop machine in the form adapted to the manufacture of center seam envelops. Fig. 2 is a plan view'of the same. Fig.'3 is an enlarged vertical longitudinal sectional elevation of the front part of my machine, showing particularly the automat-ic feeding machine and devices for transferring the successive blanks from the pile to the endless conveyer belt. l Figs. 4 and 5 are detail views of the main parts of the automatic feeding machine, showing different positions of the operative parts. F-ig. 6 is a detaily front elevation of the automatic picker and separating finger of the feeding machine. Fig. 7 is a view similar to Fig. 3 of the rear part of the machine. Fig. 8 is a vertical longitudinal sectional view of the main endless conveyer belt and grippers. Fig. 9 is a detaill Vertical sectional view of part of the same with parts b roken away. Fig. 10 .is aldetail perspective view showing oneof the adjustable cleats upon the endless conveying belt. Figs. 11, 12, 13, 14, 15 and 16 are diagrammatic views illustrating the diii'erent stages in the manufacture of a central seam envelo yby my machine, starting with the blanc and ending with the completed envelop. Fig. 17 is a view similar to:Fig..7 showing a sllght modication of my 1in-- proved machine to adapt 1t to the manufac- .ture of side 'seam envelops. Fig. 18 is a chine, beginning with the blank and ending with the completed envelop.

My improved machine may be built upon any'suitable framework capable of properly supporting the operative parts hereinafter described. As shown, .the machine frame consists chiefly of two main side frames irldicated by reference numerals 1 and 2. These side frames are suitably braced by transverse bars, tie rods and shafts which will be referred to specifically in the following specification only when necessary to point out some particular feature.

Extending horizontally between the main side frames 1 and 2 from points adjacent to the opposite ends is a main table or platform 5 upon which the adjustable side fo-ld forming mechanism is mounted, and over which the endless gripper belt travels in the manner p-resently to be explained. Leading toa the endless gripper belt is a main transferring feeding device which takes the successive blanks from an adjustably mounted pile and transfers them to the grippers upon said endless belt. As stated above, an automatic sheet feeding machine may be employed in conjunction with my improved envelop machine, or a suitable form of blank cutting mechanism may be provided for operating upon a continuous web ofypaper to supply successive blanks to the conveying devices of my machine. I have illustrated my improved machine equippedwith an automatic feeding machine which is designed to separate the successive blanks from a pile and pass them to the feeding devices of the envelop machine. The structure of this automatic feeding machine is covered by my divisional application Serial No. 586,488, filed October 11, 1910, and forms no part of the invention of the present case.

The feeding machine will now be described.

10 is the pile supporting table of the automatic feeder. This table 10 is mounted in inclined position between two rigid side bars 11 on which slide perforated ears or lugs 12 projecting from side frames 13 of the table 10. A small sprocket wheel 15 is journalcd upon ablock 16 secured -to one of the rigid bars 11, and an endless sprocket chain 17 passes'around the sprocket wheel 15 and around a similar sprocket wheel 18 keyed to a shaft 19 carrying a larger sprocket wheel 20 and journalea in suitable bearings on the slde frames of the machine.

The larger sprocket wheel 20-is driven by a sprocket chain 21 passing around a small sprocket -wheel l22 fixed to a ratchet wheel 24 journaled upon a stud 23. The shaft 19 extends from side to side of the machine and the parts 15, 16, 17 and 18 are duplicated at the opposite side of the machine. The sprocket 'chains '17 have secured to each of them a block 25 pivoted to one of the side frames 13 of the table 10, so that the gradual upward movement of table 10 is accomplished by the movement of sprocket chains 14. A gravity pawl 30 journaled at 31 rests constantly in engagement with the ratchet wheel 24 to prevent ret-rograde movement. An actuating pawl 32 is pivoted' at l33 upon a lever 34 'journaled 'to the sideframe at 35 and carrying at its lower end an anti-friction roller 36 o erating in peripheral contact with a cam 3g keyed lto the cylinder shaft 38 extending from side to side of the machine frame and driven in the manner hereinafter explained.

y The actuating pawl rests upon a controlling plate 40 which is sup-ported by a pin 41 just above the ratchet wheel 24 and movable forwardly and backwardly thereover. This cont-rolling plate 40 is pivoted at 43 to the upper end of a rock arm 44 keyed to a shaft 45 journaled in stationary-bars' 11 and extending transversely above the top of the pile of blanks. Secured to shaft 45 are the forwardly presented gage arms 46 which are designed to rest upon t-he top blank of the pile. These gage arms have upwardly curved fingers 47 against which theforward portion of the blanks are bent upwardly by the, separating mechanism in the manner presently to be explained. From this construction of pile elevating mechanism, it will-be observed that when the pile is at the proper height for the operation ofthe separating and feeding devices, the controlling plate 40 will support the actuating pawl 32 out of engagement with the ratchet wheel 24. l/Vhen the top surface of the pile falls below the required height, the downward movement of gage arms 46v will lower the i table 10 are supported at the rear by inclined gage rods 50 which are mounted at their u per ends upon blocks 51 threaded upon at justing screws 52 suitably journaled in the side frames of the machine. The se gage rods 50 operate in slots (not shown) 1n the table 10. By rotating the screws 52 by any suitable means, as illustrated, the lgage rods ma' be adjusted to support larger or smaller blanks.

The sides land 2 at thefront of the machine overhang the automatic feeding machine, and the operative parts of said machine are mounted thereon. Vertical guide fingers 60v extend from a frame bar 61 in position to engage the angular recesses b of blanks B. Angular pile holding fingers 62 engage the top of the. pile of blanks at opposite sides of the proJections forming the. bottom {iap of the envelop. The engagement of the pile with said fingers 62 is maintained by the pile elevating mechanism.

Extending transversely of the machine at its forward end isa cam shaft 70 suitably journaled in themachine side frames and carrying at one end a sprocket wheel 71 over which operates a sprocket chain 72 driven by a sprocket wheel 73 keyed to the shaft 38 vabove referred to. By this means the cam shaft 70 is constantly rotated. The shaft 70 carries three cams 75, 76 and 77 for operating the blank separating devices in the manner which will now be explained.

A rock shaft 80 is suitably journaled in the side frames of the machine parallel with the cam shaft 70 and a rock arm 81 extends forwardly and downwardly from the shaft 80 in the central longitudinal plane of the machine and has pivotally connected at 82 an upwardly extending plate 83 formed with a bifurcated upper end 84 in which is pivotally mounted a suction finger 8,5. The arm 81 journaled upon shaft 80 is formed integral with or otherwise rigidly connected with an oppositely extendin arm 81a carrying in its free end an antlfriction roller 81h which operates in peripheral engagement with the cam 76 above referred to.

The suction finger 85 is hollowed out and formed with a blank engaging suction cup in its under face in a manner well understood in this art and the tubular structure of said suction finger 85 is connected with a flexible hose 86 extending to an ordinary suction pump 87 vpivotally mounted upon the frame at 88 and provided with an actuating piston rod 89 connected withv a crank 90 driven by any suitable part of the machine. y

The suction finger 85 has pivotally connected to a downwardly projecting lug 85a a rod 91 adjustably and pivotally mounted upon the-forward end of a lever 92 journaled at 93 and carrying an anti-friction roller 94 operating upon the cam 75 above referred to.

accepta' A link or pitman 96 is ivoted at 97 to the plate 83 andv extends orwardly to the shaft on which it is guided. This pitman 96 carries an anti-friction roller 98 operating upon the cam 77 above referred to.

The rock shaft has rigidly secured to it the upwardly projecting arms 100 and'101 n arranged at an angle to each other. The

arm 101 has pivoted to it at 102 a pitman 103 extending rearwardly to the shaft 38 upon .which 1t is guided, and carrying an anti-friction roller 104 operating in peripheral contact with a cam 105 keyed to said shaft 38. A vspring 106 connecting pitman 103 with the machine frame causes said pitman to closely follow the movements' of said actuating cam.

There are two or more upwardly presented larms 100 upon the rock shaft 80 between tlie side frames of the machine, and journaled in the upper ends of said arms 100 is a shaft 110 having secured to it in the central longitudinal plane of the machine the bifurcated 'separating finger 111.' The two parts of the separating finger 111 operate in the grooves 112 cut in the opposite edges of the platel 83 of the suction separating finger and are guided thereby in their movements inwardly and outwardly over the pile and are carried by the plate 83 when said late is elevated and lowered. The separat-lng finger 111 is formed with upwardly inclined portions 111a to form with the main part of the 'nger angular catches to engage the front edge of a blank for raising it from the pile, and moving it backward and upward into position to be taken by the cylinder grippers. This freely journaled shaft.110 has secured to it an up- .wardly projecting rock arm 115 which rests against an anti-friction roller 116 journaled upon a block 117 secured to the machine frame. A torsion spring 118 is coiled upon said shaft 110 with its opposite ends secured respectively to a collar upon the shaft and a stationary point for giving the shaft a spring tendency to move in one direction, holding the arm 115 yieldingly in engagement with roller 116 for the purpose which will presently appear.

Referring brieflyrto the operation of this automatic blank feeding mechanism, it will be observedthat the cams 75, 76 and 77 cause the suction separatin finger to successively assume'the ositions illustrated in Figs. 4, 5 and 3.` ile the suction finger is performing these movements, the separating linger-111 is moved from the position shown in Fig. 4 to the position shown A cylinder. The'wheels or pulleys 125 are ad-` v secured to shaft. 38. The gear segment also apanage blank is heid in this position unta taken4 by the blank delivery mechanism which will nowl be described.

Journaled in the machine side frames above'the pile of blanks in the automatic feeding mechanism just described, is the transverse cylinder shaft 38 above referred to. The shaft 38 has secured to it a plurality of transversely adjustable wheels or pulleys 125 constituting a sectional feed justably secured to shaft 38Vby any suitable means such as set screws 125a shown in dot-ted vlines in` Fig. 3. TWO -of said wheels or cylinder sections 125 are formed With gripper slots or openings 126 through which project the curved gripper fingers 127 mounted upon a rock shaft 1.28 journaled in arms 129 adjustably secured to shaft 38..

Arms 129 are adjustably secured to shaft 38 by any suitable means such as set screws 129ashoWn in dottedlines in Fig. 3. This tends.

gripper shaft 128 carries a ,small gearwheel 130 in constant mesh with a gear segmentl 131 journaled 'at 132Nupon an arm 133 also carries an antifriction roller 134 which rims in peripheral engagement with a stationary cam 135 secured to the side frame of the machine and through Which the shaft 38 eX- A torsion spring 127c encircling shaft 128 has one end secured to the shaft and the other end secured to one of the arms 129 to give said shaft a gripper-closing movement and to hold roller 134 in en gagement with cam 135. The arms129 can be adjusted independently around the shaft 38 Wit-hin certain Vlimits to properly register theV blank upon the gripper cylinder, that is, tocause the blank to assume proper position with its longitudinal axis parallel with the direction of travel. The grippcrs 127 are also adjustable transversely of the machine upon their shaft 128 by means such as set screws 127", and the cylinder sections '125 are similarly adjustable transversely of the machine upon their shaft 38 to adapt the machine to the manufacture of envelops of different sizes.

The pair of gripper fingers 127 project rearwardly with reference to the direction of travel of the feed pulleys 125, and each finger is formed with a curved gaging face 127a which engages the edge of the blank in the direction indicated by the arrow, the blank is drawn from the top of the pile and carried upwardly beneath the curved guide rod 140 and delivered beneath the small frictional feed rollers 145 keyed to a shaft 146. 'lhe rollers 145 engage the blank against the rotating gripper cylinder 125, and when the blank is properly engaged by therollers 145,- the cam 135 releases the grippers 127 from the blank and permits the blank to be stripped from cylinder 125 and fed over the guide plates 150 into the bite of upper andy .lower frictional feed rollers 151 and 152 uponv transverse shafts 153 and 154 lwhich are driven by suitable gearing with the shafts of the vgripper cylinder and the endless gripper beltin any suitable manner.

The blank B taken from the automatic feeding machine bythe gripper cylinder in the manner above described -passes upwardly around said cylinder With its side flaps projecting laterally beyond the ends of the cylinder. The side flap at one side of the machine passes .between a grooved pressure roller 155 adjustably secured to the cylinder shaft 38 by means such as set screws 155% and a paste applying disk 156 adjustably secured to a transverse shaft 157 journaled in the removable brackets 158 secured to the machine side frames. The disk 156 is adj ustably secured by means such as set screw 156% This paste applying disk 156 is constantly rotated by any suitable means, such,

for instance, as the gear Wheel 159 keyed to the end of shaft 157 and meshing with a similar gear 160 keyed to the end of shaft 38.

161 is la paste reservoir into which the periphery of the paste disk 157 projects to take up a film of lpaste and apply it in a thin zone along the edge of the blank which passes between disk 156 and grooved roller 155. The roller 155, disk 156 and paste box 161 are capable of adjustment transversely of the machine to apply the zone offpaste along the edge of the blank for any size of blank that is to be made up into a center seam envelop. The shaft 157 carrying disk 156 can be removed from the machine by the detachment of the journal brackets 158 when the machine is to be changed into the form for making side seam envelops, or said shaft and disk can be allowed to run idly.

The curved guide plate which is arkpoint above the first sectional cylinder of the endless gripper belt presently to be cxplained. This guide plate 140a separates the pairs of upper friction rollers and 151.

165 and 166 are transverse shafts suitably journaled in the side-frames of the machine and each carrying a sectional belt supporting and drivingcylinder made up of wheels 167 and 168 as shown particularly in Figs. 8 and 9 of the drawings. The outer sections 167 of each of. these cylinders are plain Wheels or pulleys, while the section 168 is a similar wheel or pulley formed with transverse slots 169 to engage with cleats upon the inner surface of the endless gripper belt 170, and a cut-out portion 169, to permit the passage of the grippers and connected parts.

170 is an endless gripper belt formed preferably of leather with a series of cleats 171 secured to its inner surface. The belt 170 is designed to operate upon the sectional cylinders 167 and 168, the cleats 171 being so arranged that they will engage in the transverse slots or recesses 169 cut in the inner cylinder sections 168. I prefer to construct the cleats 171 as shown in Fig. 10 of the drawings in which a transverse bar 171a is riveted or otherwise rigidly secured to the inner face of the belt 17 0, and an outer adjustable section 171b formedwith a curved outer facefand a channeled inner face fitting loosely over the bar 1711. Set screws 171g` pass through elongated slots 171d yand* are threaded into the bar 1718L 'for-'securing the outer. section 171b in place. yBy loosening the screws 171C, the section 171b 'can be adjusted longitudinallyof the "belt 170 to accurately regulate the exact position ofthe belt upon the supporting cylinders, with particular reference to the positioning of the grippers carried by the belt.

The belt 170 is provided with a series of automatically operated grippers which are arranged in the central longitudinal plane of the belt. Each gripper consists of a curved outwardly bifurcated finger 175 projecting throu h a slot cut in the belt 170 and journale at 176 between the plates or flanges -17 7 projecting inwardly from the in ner face of the belt upon opposite. sides of the slot cut through the belt. These plates or ianges 177 have journaled upon themthe' anti-frlction rollers 178 which are desi ed to run upon the separated horizontal c annel -track bars 179 mounted beneath' and parallel with the carrying portion of thebelt,170. Each gripper 17 5 has an inwardly exteding 'd arm 17 5*" carrying upon op posite sides t e anti-friction rolls 17 5* which are designed to engage the curved cam tracks 180 -mounted above and adjacent to the shafts 165 and 166 for the purpose of opening and holding open thefgrppers 'at the proper oints in the operation of the machine'. Tiese anti-friction rollers 175 are designed to also en age the horizontaltrack`bars-179 for holdlng the lgrippers in closedposition while carrying the blanks, as show n clearly in Fig. 8 of the draings.

The belt carryin cylinders' 167 and 168 upon shafts 165 an 166 are so mounted in the machine that the upper or carrying porpresented in` the 'passed forwardly y the coperating friction of the endless vgripper belt `170 will be n'e of feed of blanks tion wheels 151 and 152 above referred to.

The carrying portion ofbelt 17 0 is arranged to be su ported by the horizontal table 5 above referred to. -J ust above the cylinder upon shaft 165 is presented a pair of anti.

friction rollers 185 freely journaled upon a t curved arm 186 pivoted at 187 to the extension of uide. late 140, This arm 186 isz yielding y hel in osition by a tension spring 188. The ro ers 185v which-are arranged upon 'opposite sides of the guide plate extension-140a are designed to engage the outwardlyv projecting gripper linger 175 as itis drawn beneath the rollers by the movement of the belt, and cause the` closing of said `grip er -fnger upon the forward edge of the b ank, the .rollers 185 holding a grlpper finger in 'closed'. position long enough toL insure the engagement ofantifriction rollers 175h beneath the horizontal track Vbars 179."""Ihe engagementlof the `bl ank `by thebgripper upon the Uendlessfjbelt.

carries theank through the -sidefold forming nrnachanism` which will now bedescribed. Y v A vj Projecting upwardly from the'side frames 1 and2 in the transverse plane of the shaft 165,'are the side standards 190 in which said 'shaft 165 is journaled.' A bridge plate 191 'entends across the machine and-is suitably A each end of the bridge plate 191, saidadjusting screws extending inwardly and passing through threaded lugs 196 projecting upwardly from the4 slides 192. By this means the slides 192 can bel independently and accurately adjusted laterally of the machine. These slides 192 carrythe downwardly extending' arms 197 (indicated inv dotted lines in Fig. 1 of the drawings) and are the horizontally extending fold forming plates 198 having very thin outwardly presented edges to engage the side flaps of the blank as they are folded over for the purpose lof accurately dening'the side folds .of

Asecured to the'lower ends of said arms 197 slotted bracket plates 201 adjustably mounted upon the bed 5 'by means of set screwsA 202;v These fold formers 200 have as usual the horizontal portionsy 200 arranged just above and parallel with the carrying portion of endless belt 170 to permit the free move- Inent of the blank over them, and the twisted or spiral flange portions 200b ending in the upper inwardly presented flange portions which are supported just above the supporti ing plates 198 to present a part of a fold forming plate 200 beneath a plate 198 and a.

formers above horizontal portions 200a andv beneath plates 198. The side flaps coming into engagement with the twisted portion 200b of the formers are gradually bent upwardly and over toward the center of the blank and since the twisted portion of the former at one side engages one side flap before the twisted portion of the former at the opposite side, it will be understood that the side flap of the first mentioned side will be folded in just in advance of the folding in of the opposite side flap. The side flap which is the last to be folded in toward the center' is the one which has been supplied with a line of paste upon-its inner face at its outer edge, so that when both side flaps are properly folded in, the pasted face of the outer flap will be brought into contactl with the unpasted edge of the other flap to foi-n1 a center seam in the envelop blank.

Extending upwardly from the side frames 1 and 2 in transverse plane of the shaft 166 are the standards 210 in the upper ends of which is journaled a transverse shaft 211 carrying centrally between its ends a friction roll 212. Journaled upon the shaft 211 upon opposite sides of the roll 212 are 'the forwardly presented arms 215 connected at their forward ends by a rod 216 and having journaled in the downwardly presented lugs 217 a friction roll 220. Endless pressure belts 225 pass around the rolls 212 and 220 aud engage the upper face of the endless belt 170 in. lines corresponding with the folded edges of the blank after it has passed through the fold forming mechanism above described. These pressure belts 225 press down the folded sideedges of the blank after it has passed said forming mechanism.

These belts 225 can be adjusted inwardly or outwardly upon their rollsby any suitable means (not shown). The shaftv 211 is provided with a sprocket wheel 226 driven by a sprocket chain 227 operated from a suitable driving sprocket 226a upon the' shaft 2.26by or other suitable rotating part of thema-- The shaft 226b carries an intermechine.

" forming mechanisms.

diate gear v226e` of the main gear train by which it is driven. It will 'be observed that the arms 215 can be raised upwardly when it is desired to have access to the blank or` endless belt 170 'beneath the pressure belts 225.

After passing beneathy the pressure belts` 225 the gripper 175-releases the blank and by the engagement of the blank at its edges i between belts 225 and 170,1it `is continued rearwardly over the guide plate 230 into the bite of upper and lower feed rollers 235 and 236 mounted lupon suitable transverse shafts and driven by gearing with other parts of the machine'in. a manner well understood. A curved guide arm 240 is supported'abo've the plane of blanks between the rollers 212 and 235 to confine the leading edge of the blank in the event of any tendency to bendY upwardly. The blank withthe side'flaps folded and sealed in the manner explained is passed by the rollers 235, 236 to the final creasing and bottom flap pasting and forming mechanisms constructed as Will now be explained. I 245 and 280 are transverse shafts suitably j ournaled in the side-frames of the machine above and below the plane 'of travel lof the blanks. These shafts carry the upper and lower members of the creasing and end flap Mounted upon the lower shaft 245 adjacent to its center are the radial arms 246 carrying the final gripper' mechanism and the female member of the end ap creasing mechanism. Means such as set screws 246x. adjustably secure arms 246 upon shaft 245. formed with enlarged heads having outwardly presented rectangular slots or re- Cesses 247 in which are mounted the transversely extending rectangular' creasing bar 248 and pressure bar 2483.

transverse groove', or recess 249 constituting the female member of the end flap creasing mechanism. Slots 250-are formed `between the bars 248 and 248a through' which extend the gripper arms 251, each having an i11- wardly projecting gripper finger 252 (see Fig. 18). These gripper arms 251 projecting approximately radially to the shaft 245, are adjustably mounted (by means of bolts 255 passing through slots 256) upon the transversely movable gripper bars 258 which have pin and slot connections at their inner ends as shown in dotted lines at 259 in Fig. 18 of the drawings. The gripper bars"I 258 are'eapable of moving transversely of the machine and radially of their carrying frame. Springs 260 connect the gripper bars 258 with the radial arms 246 for giving the gripper bars a tendeney'to move toward the sides of the machine, while springs 261 connect the gripper bars 258 with arms 246 to yieldingly hold said grip- The creasingbar 248 is formed inits outer face with a These arms 246 are 4 pers against the'creasing bar 248 and pressure bar 2488. 1 f v Secured to each side frame 1 and 2 adjacent to theends of the shaft 245 are the stationary 5 cams 265, in engagement with which the 4ends of gripper bars 258. operate. Each cam 265' comprises a face cam for causing oneof the gripper bars to move inwardl wardly transversely of the mac 'anda 10 similar cam for moving the gripper bars radially with reference to shaft 245. While these cams 265 independentl act upon the two gripper bars, it will o course-.,beunfderstood that they are arranged to act in 1.5 unison so that the two gripper bars will operate simultaneouslytocause the grippers mounted upon them -to engage and disengage the blanks. The detail construction of this final gripper mechanism is partly 2Q shown in Fig. 7 of the drawings in connection with the machine for forming a central seam envelop, but vis more fully shown' in Fig. 18 of the drawings,` illustrating the modified arrangement" of the machine' for 29./ making side seam envelops. So fan as this v.gripper mechanism' isjconcerned, its con- 'struction is the same for either form of machine.

The shaft 245.alsocarries' two korffmore segmental frame vpieces y 270 adjustably mounted upon the shaft by suitable means such as set screws 270". Each frame 270 is formed in its periphery with a plurality of transversely arranged .dove-tail sockets or .35 pockets 271 to f'eceive a creasing bar .272

formed with a creasing slot 27 3 and held in place by means of set ,screws 274. This .creasing bar 272 is designed to cooperate with a similar creasing bar mounted in a 40 similar vframe above the plane of feed of the blanks as hereinafter explained. By forming the segmental frames 270 with a plurality of receivingsockets 271, it will be understood that the position of the creasing bar 272 can be adjusted upon the frame to V regulate its distance circumferentially from the lower creasing member 249 above referred to. These lsegmental members 270 are preferably arranged in parallel loggi- 501 tudinal vertical planes of the machine; as

close as practicable to the parallel planes of gripper fingers 252 above referred to. The grippers and the frames are both adjustable either circumferentially of the carrying yframe or transversely of the machine to suit insana?.

iliaryseental iframe members 275 (see.A

Fig. 7) which are also adjustably mounted upon j the'shaft .245' in different longitudinal verticalplanes from the other parts of said rotating frame for the purpose of circum ferentially bridging the space between the heads .ofarms 246 and the segmental frame members 270so that the envelop in process of.. formation will be "properly l supported Adurmg. theifinjal vstages of the operation.

The vshaft 280 above referred to carries the uppersectional rotary frame which cooperates with the similarly formed vframe upon vshaft v245 just described. This upper frame includes a plurality of radial arms 281, the segmental frame members 285 and the auxiliary segmental frame members 290. y

All Aof these parts are adjustably mounted both transversely and circumferentially upon the shaft'280', the arms 281 being adjustably secured by means such as set screws 281,'the members 285 by means such as set -screws 285",-and the members 290 by means such as set screws 290".

The arms 281 are formed with bifurcated outer ends andV secured to faces 281'of said arms is -a transversely exten ding creasing blade 2,82 which is designed to engage the transverse slot or groove 249 formed in the bar 248 of the lower rotary frame.l The arms 281jand 246 are adjusted to bring the blade 282 and slot 249 into .accurate engagement to form the ltransverse crease in the bottom iiap of the envelop as the partly folded envelop is` brought mto position between said creasing members. A .y 283 is a rock shaft journaled in projections of arms 281, and 284 is a transversely extending spring pasting plate secured to the rock shaft 283. y

286'is a rock arm projecting from rock shaft 283 and carrylng an anti-friction lroller 287 which runs inperipheral engagement with a stationary cam 288, secured to one of the side frames of the machine. If desired I may provide two rock arms 286 andI twoicams. 288 atl opposite sides of the machine. y

I' The pasting blade or plate 284 is supported approximately tangentially to the path of'v rotation of the rotary frame upon which it is mounted. and its operating means cause it to move inwardly and outwardly transversely of this path of rotation of the supporting frame. The blank creasing members `249 and 282 engage-the blank in rear of the end flap and support the blank with the end flap projecting freely from the creasin mechanism in the path of the pasting bla e. v l

289 is a aste receptacle mounted upon a transverse ar y289a supported by auxillary side brackets 289b detachably-secuped to the main side frames 1 and 2 of theiemachine. A-pasting roll 291 operates'in the peste -rccptacle 289 and is journaled in bracket bearings formed partly vin the auxiliary brackets 289" and partly in t-he main side frames of the machine. This paste roll 291 carries upon one of the projecting ends of its shaft a sprocket wheel 292 over which passes a sprocket chain 293 driven bya smaller sprocket wheel 294 keyed to the end of shaft 280. y L.

The rotation of the sectional frame carried by shaft 280 in the direction indicated by the arrow in Fig. 7 will cause the spring paster plate 284 to be wiped against the mtating periphery of paste roll 291 to take therefrom a film of paste, and when completing its rotation to the position shown in Fig. 7, will wipe against the projecting bottom flap of the envelop while the same is momentarily held between the twocreasing members 249 and 282, said wiping contact with the flap applying suilicient paste to the bottom flap to cause it to seal the end of the envelop when it is folded over onto the already centrally seamed blank.

The segmental frame members 285 are of the same construction as the above described segmental members 270 of the lower rotating frame. These members 285 are formed with the dove-tailed transverse sockets or pockets 285 in which may be removably mounted the creasin bar 300 carrying a creasing blade 301. ince the creasing bar 300 can be placed in any one of the series of sockets or pockets 285, its. dist-ance circumferentially from'the creasing blade 282 can be adjusted. The blade 301 is so positioned upon its carrying frame that it will meet and engage the transverse slot or groove 273 in the creasing bar 272 of the lower frame. The coperation of these two creasing members imparts the final transverse fold in the top flap of the blank when the envelop is formed with said top flap.

:Y When the envelop is not provided with a top Hap, the creasing bars 272 and 300 can be removed from their frames.

rl`he auxiliary segmental frame pieces 290 are of the same construction and for the same purpose as the auxiliary pieces 275 of the lower rotating frame, the position of members 290 upon the upper frame being adjusted to correspond with the position of the members 275 upon the lower frame, so

that the blank will be engagedbetween said members as these two frames rotate in unison.

The two rotating frames above and below the plane of feed of the blankas just described are driven by meansof gears upon the projecting ends of their shafts 245 and 280,2{zwhich gears are driven through idler wheel from the shaft 166 ofthe machine.

The blank with the centrally formed seam is passed by the coperating rollers 235, 236 into position above the lower rotating frame erationthe gripper fingers 252 are brought .into engagement with the folded side edges"i` of the partly completed envelop. As these frames continue to rotate, the envelo (with bottom flap bent upwardly slightly ecause of its crease) is carried past a cylindrical bar 305 supported upon arms 306, and said bar folds over the pasted bottom flap upon the creased line and the arms 306 engage said vlap and hold it bent inwardly until the bottom fold is engaged by roller 310 to cause the bottom flap to adhere to the body of the envelop. The grippers 252 hold. on to the .envelop until the blank is engaged by the transverse roller 310 which is grooved at 310a to fit over grippers 252, after which the envelop is passed through the delivery rollers 315, 316 and delivered by them into a packing box 320 operating in the usual manner.

The exact position of the rollers 315 and 316 beneath roller310, shown in the drawings, is not essential, since the flexibility of the envelops and thev direction of rotation of rollers will accurately lead the advancing end of the envelops into the bite of rollers 315 and 316, without the assistance of guiding means.

The auxiliary segmental frame portions 275 and 290 are correspondingly arranged above and below the path of the envelop so as to engage the same and assist the grippers in the forward feed. The bottom flap seam is pressed for securely sealing by the rollers 310, 315 and 316, t-he roller 310 acting against pressure bar 248a and the roller 315 being formed with a longitudinali groove 315a to bridge over the inner edge of bottom flap to escape any glue which may be squeezed out by the pressure.

In Figs. 11 to 16, both inclusive, I have illustratedthe several stages in the formation of a center seam envelop. Fig. 11 shows the blank. This blank B is fed from the pile by the automatic feeding machine with the bottom flap B leading. -As the blank passes up varound the gripper cylinder 125 a line of paste a is applied to the inner face of one side flap as shown in Fig. 12. The blank then passes through the side fold forming mechanism under the action of the endless gripper belt 170 to fold and seal the two side flaps to forma center seam shown at c in Fig. 13. The side folds are completely creased by the vaction of thev pressure belts 225 and the blank is then passed to the final creasing and pasting mechanism to-receive the transverse crease d and4 transverse feeding rollers 310 and 315.

. pasting blade 284 vthe iinal creasing 'making side seam envelops such as illustrated in the diagrammatic views ofFigs. 19 to 23, both inclusive. For the manufacture of the side seam form of envelop, I remove or utfout of operation the preliminary pasting device 156 and the final pasting de- V vice 291. These parts can be removed'by detaching the pasting rolls and pastmg boxes from the frame, without the necessity of the removal of the grooved wheel 155 which coperates with the preliminary pasting device, or the'pasting blade 284 which coperates with the final pastlng device, the

tions withoutper orniing any function when pasting remove from the first form of the machine bars 272, 300, the bottom flap turning bar 305, and the sealing and The remaining parts of the machine may remain the same, although I prefer to employ in addition to the segmental frames 270 upon shaft 245, the grooved segmental frames 339 to cooperate with a different form of past-lng device as will. presently be explained. Frames 330 are preferably formed with divided hubs 330EL secured upon shaft 245 by screws or bolts as shown inFig. 17 of the drawings. The paste supporting bracket frame 2891 having been removed, a modified form of bracket frame 335 is secured to the flanges at the ends of the side frames as shown in Fig. 17. This auxiliary frame 335 supports a paste receptacle 336 in which operates a paste roll 337, which may be the same roll heretofore indicated by reference 291. The shaft of this roll 337 which is journaled in the frame 335 may be driven in any suitable manner such as by a sprocket .wheel 337a driven by sprocket chain 337b and sprocket wheel 337c on the projecting end of shaft 280. Arms 338 are journaledupon the shaft of paste roll 337 and a shaft 339 is freely journaled in said arms 338 and is provided at its end with a gear 340 meshing with a gear wheel upon the end of shaft 245. The shaft 339 carries two paste applying segments 345 which are formed with peripheral ribs adapted to operate in the peripheral grooves of segments 330 upon shaft 245 to press the inwardly folded side flanges of the blank into the grooves of said segroll 291 is removed.- I also.

ments to betterv apply lines of paste. The paste applying segments 345 rotate in peripheral engagement with the rotating paste roll 337 to take up a lm of paste therefrom preparatory to applying it to the edges of the blank. Segments 345 are adjustably mounted upon of the sectional hub 345 and'screw bolts securing said hub sections upon the shaft as shown in Fig. 17 of the drawings. Inthis form of att-achment, I'prefer to provide a different envelop delivery mechanism comshaft 339 by means prising .belt rollers 350 and 351 supporting delivery belts 352 which receive the completed envelops from the under rotating frame and carries them through transverse rollers 355 and 356 from which they are deposited into a suitable rece tacle.

In the operation of thls modified form of the machine, it will be understood that the blanks C of the form shown in Fig. 19, are taken from the automatic feeding machine by the gripper cylinder, with the long bottom- Hap C leading. The blank is carried through the machine and the narrow side iiaps L are folded inwardly by the side fold forming mechanism into the position shown inv Fig. 20. The blank with side folds is thenpassed to the control of the upper andflwer rotatingframes upon shafts-4 245 and 280with the long bottom flap C pro- ]ectln'g. entirely beyond the line of crease le.

.The creasing devices 249, 282'then engage the blank to form the crease la at which moment the flap C extends loosely downwardly around the lower rotating frame upon shaft 245 and the paste applying segments are ,just approaching their active position. The infolded side flaps k beingthen gripped by the grippers 252 at point p (see Fig. 21) and the paste applying segments 345 cornlng into engagement with the blank along the infolded flaps h, apply lines of paste upon said flaps as shown in Fig. 22. As the blank with double line of paste is carried downwardly by the lower rotating frame, the forwardly projecting long flap C will restupon the roller 316, and if desired may be partly supported in place by a deiiector plate 360. The grippers in this form of the machine hold on to the blank until it is en gaged between the segments 270 and the belt rollers 350 with the result that the long iap C will be pressed at its edges against the glued surfaces of inwardly folded side flaps h and the completed envelop carried by belt 352 to the delivery rollers 355, 356. It will of course be understood that in this side seam form of envelop, an end flap can alsov so that it can readily be placed upon or rev justed into and out of operative position, to

- thereby provide individual means for placside liaps into a blank.

ing each pasting device into and out of operation. Such construction facilitates the changing of the machine to suit the type of envelop to be manufactured.

In describing the operation of my improved machine, I have referred to the manufacture of two types of envelops which I have distinguished as the center seam envelop and the 'side seam envelop. It will of course be understood that the characteristie of what I have termed the center seam envelop is the single longitudinally extending seam for uniting two inwardly folded It will readily be understood that by the proper adjustment of the operative parts of the machine, this single longitudinal seam for uniting the inwardly folded side flaps of the blank may be formed in the direct central longitudinal line of the envelop, or it may be formed upon either side of this central longitudinal. line of the envelop by previously preparing the blanks with one side flap wider than the other. The side seam form of envelop referred to by me mayalso be slightly modified to have the side seams directly. at the longitudinaledges of the envelop, or farther in from the edges.

What I claim is:

l. In an envelop machine, the combina-v tion of suitable feeding devices for conveying envelop blanks, suitable side fold forming mechanism, and suitable transverse creasing mechanism, with a center seam pasting device, and the side seam and bottom flap pasting devices, said side seam and bottom flap pasting devices being interchangeable with each other, whereby the machine may be arranged to produce different styles of envelops.

Q ',In an envelop machine, the combina-l veying envelop blanks, suitable side fold forming mechanism, and transverse creasing mechanism adapted to crease an end iap and temporarily support the blank with the creased Hap projecting freely from the creasing mechanism, with a'bottom Hap pasting device mounted to rotate free from contact mechanism.

4. In an envelop machine, the combination with suitable feedingV devices for conveying envelop -blanks, suitable side fold forming mechanism, and transverse creasing mechanism adapted to crease an end Hap' and temporarily support the blank vwith the creased flap projecting freely from the creasing mechanism, with a bottom flap pasting device 'including a paste supply roller, a rotary frame, a flap pasting blade pivoted upon said frame, and a cont-rolling cam moving said blade alternately into engagementwith the paste supplyroller and the projecting end of an envelop. Hap held in the creasing mechanism. v

5. In an envelop machine, the combination with suitable feeding devices for con- Vey-ing envelop blanks, suitable side fold forming mechanism, and transverse creasing mechanism adapted to crease an endfiap and temporarily support the blank with the creased flap projecting freely from the creasing mechanism, with a center seam pasting device, and a bottom flap pasting device comprising a rotary frame, a rock shaft journaled in said frame, a flap pasting blade upon said rock shaft, a paste supply roller, a controlling cam, and a rock arm upon said rock shaft operating in engagement with said cam, the pasting blade being mounted to rotate free from contact with the creasing mechanism and alternately engage the paste supply roller vand the projecting end flap held by the creasing mechanism.

' 6. In an envelop machine, the combination of suitable feeding devices for conveying envelop blanks, suitable side fold forming mechanism, a suitable transverse creasing mechanism including the relatively movable creasing blade and creasing bar adapted to crease and support a blank with the flap projecting freely from the creasing mechanism, with a bottom Hap pasting device including a flap pasting-blade mounted' to move With the creasing mechanism free from contact therewith and means for supplying paste to the pasting blade and means for moving the pasting blade into contact with the free end of a projecting flap While it is held by the creasing mechanism.

y7. In an envelop machine, the combination of suitable feeding devices for conveyving envelop blanks, suitable side fold forming mechanism, and suitable xtransverse creasing mechanism, with a bottom. iiap pasting device including a paste supply roller, a rotary frame, a iap pasting blade pivotally mounted adjacent to the periphery o f said rotary fra-me and extending approximately tangentially of the path of rotation .ing

endless conv ver belt provided with a series otgrippers arranged in the central longitudinal line of said belt, means'for supporting' and driving said belt, gripper controlling, track bars arranged beneath and parl allel with the carrying portion of said belt,

' chine,

arms engage beneath said an arm projecting inwardly from each gripper,.`and means for closing said grippers and holding them closed until said gripper track bars, Whereby the grippers are securely held in closed position for conveying sheets.

9. The combination, in an envelop machine, of the side fold the transversetlap creasing endless conveyer belt provided with a series of grippers, means for supporting and-driving said belt, gripper controlling track bars arranged beneath and parallel with the carrying portion of said belt, an larm projecting inwardly from each gripper, and a spring pressed roller adapted to engage and close said grippers and hold them closed until said gripper arms engage beneath said track bars. n

VV10. The combination, in an envelop, machine, of the side fold forming mechanism, the transverse fiap creasing mechanism, and suitable paste applying devices, with an endless conveyer belt provided with a series of grippers, means for supporting and drivin said belt, track bars arranged'beneath an parallel Withl the carrying portion of said belt, anti-friction rollers mounted upon the inner face of said belt and adapted to travel upon said `track bars for supporting the carrying portion thereof, an arm projecting inwardly from each gripper, stationary curved cam tracks adapted to engage said gripper arms for opening said grippers, vand means for closingsaid grippers and holding them closed until said gripper arms engagebeneath said ltrack bars. l1. The combination, in an envelop mathe transverse tiap creasing mechanism, and suitable paste applying devices, With an endless conveyer belt provided with a longitudinal series of grippers, mea-ns for supporting and driving said belt, track bars arranged beneath and parallel with the carrying portion of said belt, anti-friction rollers said path of4 rotation to' forming mechanismI mechanism, andv sultable paste applymg devices, .with an- Aber rigidly of the side fold forming mechanism,-

mounted upon the inner" face ot said belt and adapted to travlu'ponsaid track bars for supporting the'carrylng portion thereof, an arm projectinginvv'ardly,from each gripper, means forv opening said grippers,an.d a springpressedl roller supportedin the path of said grippers 'and adapted to' engage and closeV said grippers andv hold .them closed until said gripper arms engage' beneath said track bars.` l

l2. The combination, in an envelop inachine, of the side fold forming mechanism, the transverse flap creasing mechanism, and suitable paste applying devices, with an endless conveyer belt provided with a longitudinal series of grippers, means for supporting and driving said belt, track bars arranged beneath and parallel with the carrying portion of said belt, anti-friction rollers mounted upon the inner face of said belt and adapted to travel upon said track bars, an

arm projecting inwardly from each-gripper and carrying an anti-friction roller, stationary curvedcam tracks adapted to engage said gripper arms for openingsaid grippers, a sprlng pressed roller supported above the plane of feed of blanks inposit-ion to engage the grippers and force them into closed position and cause said gripper arms to engage beneath saidtrack bars, and means for supplying blanks into position to be taken by said grippers.A

13. In an envelop machine, the combination of side fold forming mechanism, transverse flap creasing mechanism, and suitable paste applying mechanism, With means for conveying envelop blanksl successively through said machine, said conveying means including a broad endless conveying belt, supporting and driving cylinders for said belt, transverse slots formed in said cylinders, transverse cleats secured to the inner face of said belt and engaging. said cylinder slots, each of said cleats consisting of a memsecured to the belt and a channeled Wear member fitting over said rigidly attached member and adjustable thereon longitudinally of the belt.

14. In an envelop machine, the combination of side-fold'forming mechanism, transverse iap creasing mechanism, paste applying mechanism, With means for conveying envelop blanks successively through said mechanism, said conveying means including a broad endless conveying belt, supporting and driving cylinders for said belt, transverse slot-s formed in saidl cylinders, inner face of said belt and engaging said cylinderslots, each of said cleats comprising a bar rigidly secured to the inner face` of said belt, and formed With a channel in which said rigidly attached member is loosel inclosed, and set screwsseated in said rigi ly attached memtransverse cleats secured to thev and suitable a curved Wear member v 

